A common scam these days (my elderly uncle was a victim and they tried it on my son), caller says he is with your bank’s security department and their review shows your account may have been hacked. Some employee at your local branch is involved so only deal with us. They offer to reset your password and add security with help from Microsoft.
Of course the MS help is to add remote access to your PC. Now they have access to your PC and online banking.
The scam has a few variations but always is based on the story of you already being a victim and they can help. Fear and isolation is the approach. My uncle’s bank noticed unusual online activity and froze the account then notified adult protection services who notified me. My uncle was so scared that his phone and home were under surveillance that it took three days for me to get him to explain the whole situation and convince him “Nancy” was a crook and not with his bank.